Behringer Truth B3031A wont power up

[Logistics]

My cousin sent one of his studio monitors to me in hopes I can fix it. Apparently, PG&E was doing a rolling blackout in his area, he forgot, and one of the two monitors developed this problem.

When you flip the power switch, you hear a light turn-on pop as the power LED flashes once, very briefly, and then power cuts back out. Interestingly, when I flip the switch back to the off position, after a couple moments, BIG turn-on pop, and LED stays lit up for several seconds, and fades out like you would expect.

Nothing on the PCB looks burned, the fuse must still be good if it tries to power on at all. Ideas?

Matthew

P.S. This is not a picture of the actual unit, but the same unit online.

[budm]

Re: Behringer Truth B3031A wont power up

You need to start checking Voltage first, see those two devices in TO-220 case form factors, they should be for + and - regulated power supply.
You should check the Voltages on all 3 legs to see what you have, also get the P/N as printed on the body.

[Logistics]

Re: Behringer Truth B3031A wont power up

Should I disconnect the transformer and check voltages on all legs, first?

[Andrew F. Ali]

Re: Behringer Truth B3031A wont power up

Only if you think the transformer has problem. However. I would suggest measuring the in/out voltages on the TO-220 +ve and -ve regulators as advised, to start.

[budm]

Re: Behringer Truth B3031A wont power up

Should I disconnect the transformer and check voltages on all legs, first?

You would not have any LED's light up if the transformer is not working, the transformer only has one winding with center tap (Yellow - Brown - Yellow) on the secondary side.
Primary winding is using Black wire and Blue wire, the Red wire is capped off not used.